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Questions and Answers
What is the purpose of GRASP patterns?
Who is the creator of GRASP?
What is the definition of a responsibility in UML?
Why are GRASP patterns important in object design?
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What is the main difference between GRASP patterns and other design principles?
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What is the benefit of using GRASP patterns in software development?
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What is the reason behind the creation of GRASP patterns?
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What is the focus of GRASP patterns?
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What is the relationship between GRASP patterns and object design?
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What is the primary goal of using GRASP patterns in software development?
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What is the primary goal of applying the Low Coupling pattern?
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Which GRASP pattern suggests assigning responsibilities to a controller class?
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What is the primary consideration when deciding which class should create instances of a new bank account?
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Which pattern promotes high cohesion and minimizes coupling by assigning responsibilities?
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What is the primary benefit of using the Observer pattern in the system?
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Which class is responsible for calculating interest on a bank account?
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What is the primary goal of the Information Expert pattern?
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Which pattern suggests implementing an Observer pattern to notify interested parties?
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What is the primary goal of the Creator pattern?
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Which class is responsible for handling the process of transferring funds between bank accounts?
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What are the two main types of responsibilities in object-oriented design?
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What is an example of a 'doing' responsibility of an object?
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What is a key characteristic of a GRASP pattern?
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Which GRASP pattern assigns a responsibility to the class that has the information needed to fulfill it?
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What is the problem that the Information Expert pattern solves?
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How many GRASP patterns are there?
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What is the purpose of the Creator pattern?
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What is an example of a 'knowing' responsibility of an object?
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What is the purpose of GRASP patterns?
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What is the main difference between 'doing' and 'knowing' responsibilities?
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Study Notes
GRASP (General Responsibility Assignment Software Patterns) is a methodical approach to learning basic object design, providing a framework for assigning responsibilities to classes and objects. It encompasses nine design principles, including Information Expert and Polymorphism, which guide the creation of robust, maintainable, and scalable software systems.performance, reduced maintenance costs, and faster development times.
Responsibilities
- A responsibility is a contract or obligation of a classifier
- There are two types of responsibilities:
- Doing (e.g., creating an object, initiating action in other objects, controlling and coordinating activities)
- Knowing (e.g., knowing about private encapsulated data, related objects, or things that can be derived or calculated)
GRASP Patterns
- Experienced object-oriented developers build up a repertoire of general principles and idiomatic solutions that guide them in creating software
- A pattern is a named problem/solution pair that can be applied in new contexts
GRASP Patterns - Examples
-
Creator: Assign the responsibility of creating instances of a class to the class that has the most knowledge about when and how to create them
- Example: Assigning the responsibility of creating new bank account instances to the Bank class or AccountManager class
-
Information Expert (or just Expert): Assign a responsibility to the class that has the necessary information to fulfill it
- Example: Assigning the responsibility of calculating interest on a bank account to the BankAccount class
-
Low Coupling: Aims for classes to have minimal dependencies on each other, facilitating easier maintenance and flexibility in the system
- Example: Implementing an Observer pattern to notify interested parties of changes in bank account balances without tightly coupling them to the BankAccount class
-
Controller: Assign the responsibility of handling system events or coordinating activities to a controller class
- Example: Assigning the responsibility of handling the process of transferring funds between bank accounts to a TransactionController class
Additional GRASP Patterns
- High Cohesion: Aims to keep a class focused on a single responsibility
- Polymorphism: Allows for multiple forms of a class, providing flexibility in object decomposition
- Pure Fabrication: Creates an artificial class to resolve a problem that doesn't have a natural class
- Indirection: Decouples objects that would otherwise be tightly coupled
- Protected Variations: Encapsulates the behavior of an object, allowing for changes without affecting other objects
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Description
Learn about GRASP patterns and their application in software construction. Understand the General Responsibility Assignment Software Patterns and how they are used in software development.
